期刊
EUROPEAN PHYSICAL JOURNAL C
卷 64, 期 2, 页码 171-179出版社
SPRINGER
DOI: 10.1140/epjc/s10052-009-1143-7
关键词
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资金
- Portuguese FCT-Fundacao para a Ciencia e Tecnologia [POCTI/FNU/49501/2002, POCTI/FNU/50192/2003]
- MEXT
- JSPS [18002006, 20540299, 18540281]
- Daiko Foundation
- Yamada Foundation
- DFG cluster of excellence 'Origin and Structre of the Universe'
- Israel Science Foundation
- Israel Academy of Sciences and Humanities
- Ministry of Science and Higher Education [41/N-CERN/2007/0]
- KBN [134/E-365/SPUB-M/CERN/P-03/DZ299/2000]
- Grants-in-Aid for Scientific Research [18540281, 18002006, 20540299] Funding Source: KAKEN
- Fundação para a Ciência e a Tecnologia [POCTI/FNU/49501/2002] Funding Source: FCT
The longitudinal polarisation transfer from muons to Lambda and (Lambda) over bar hyperons, D-LL(Lambda(Lambda) over bar), has been studied in deep-inelastic scattering off an unpolarised isoscalar target at the COMPASS experiment at CERN. The spin transfers to Lambda and (Lambda) over bar produced in the current fragmentation region exhibit different behaviours as a function of x and x(F). The measured x and xF dependences of D-LL(Lambda) are compatible with zero, while D-LL((Lambda) over bar) tends to increase with x(F), reaching values of 0.4-0.5. The resulting average values are D-LL(Lambda) = -0.012 +/- 0.047 +/- 0.024 and D-LL((Lambda) over bar) = 0.249 +/- 0.056 +/- 0.049. These results are discussed in the frame of recent model calculations.
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